SIMBAD references

2003A&A...403L..37C - Astronomy and Astrophysics, volume 403, L37-41 (2003/6-1)

Abundant H2D+ in the pre-stellar core L1544.

CASELLI P., VAN DER TAK F.F.S., CECCARELLI C. and BACMANN A.

Abstract (from CDS):

We have detected the 372 GHz line of ortho-H2D+ towards the pre-stellar core L1544. The strongest emission (Tmb∼1K) occurs at the peak of the millimeter continuum emission, while measurements at offset positions indicate that H2D+ is confined within ∼20'', where CO is highly depleted. The derived H2D+ abundance of ∼10–9 is comparable with previous estimates of the electron abundance in the core, which suggests that H2D+ is the main molecular ion in the central 20'' (2800AU) of L1544. This confirms the expectations that H2D+ is dramatically enhanced in gas depleted of molecules other than H2. The measured abundance even exceeds the present model predictions by about a factor ten. One possibility is that all CNO-bearing neutral species, including atomic oxygen, are almost completely (>98%) frozen within a radius of ∼2800AU.

Abstract Copyright:

Journal keyword(s): ISM: individual: L1544 - ISM: molecules - radio lines: ISM

CDS comments: IRAS 4 = [JCC87] IRAS 4A protostar.

Simbad objects: 6

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2021.07.24-14:09:21

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